Many people may disagree with me, but I firmly believe that until Linux can successfully mingle with Windows machines, on Windows terms, it will never succeed to the extent that it should. Sure, in a perfect world we wouldn't need to worry about such things, but let me assure you we live in a world that is far from ideal and Windows currently dominates it. What this means is we either have to play by their rules (to an extent) or maintain a relatively low share of the market. It's really that simple. How many distributions available today have the functionality it takes to be a part of a full-fledged Windows domain? The answer is simple: One.